Unit not available for assign

I just bought a new VERA 3 (stepping down from HC2), but when I try to assign my unit to my account, I get this message:

Unit not available for assign

I see that the device has an IP address and the leds are all green. But when I go to add my unit (with the correct serial and MAC address(checked on my router). I get this message every time.

Somebody has an idea what the problem is?

@remcoploeg,

Welcome!

It may be running UI5. See this topic.